Split Air con

Quote in from the chap who did our business AC. Thoughts?

QUOTATION

Air Conditioning System Installation – Scope of Works

We propose the supply and installation of a new air conditioning system, comprising both

indoor and outdoor units. The system will be installed to manufacturer specifications and

in compliance with current industry standards.

All interconnecting services — including refrigerant pipework, interconnecting cable, and

condensate drainage, power flex.

A dedicated power supply will be required for the air conditioning systems. This will

involve the installation of a new circuit from the main electrical consumer unit to the

external condenser unit. This is not a service we can provide.

Please see the email for attached brochures of selected equipment

System 1

Kitchen

Model Mitsubishi HI SRK35ZS-WF Inverter wall

Mounted Split System Heat Pump

Cooling Capacity 3.5 kW

Heating Capacity 4.0 kW

Master Bedroom

Model Mitsubishi HI SRK25ZS-WF Inverter wall

Mounted Split System Heat Pump

Cooling Capacity 2.5 kW

Heating Capacity 3.0 kW

Outdoor Unit

Model Mitsubishi HI SCM50ZS-W Outdoor Unit

Cooling Capacity 5.0 kW

Heating Capacity 5.8 kW

Refrigerant R32

Power Supply 20amp supply terminated in a rotary isolator.

Price

Our price for the supply and installation of the equipment all as herein specified

would be: -

£3442.00 + 0%VAT
Click to expand...

System 2

Lounge

Model Mitsubishi HI SRK35ZS-WF Inverter wall

Mounted Split System Heat Pump

Cooling Capacity 3.5 kW

Heating Capacity 4.0 kW

Second Bedroom

Model Mitsubishi HI SRK25ZS-WF Inverter wall

Mounted Split System Heat Pump

Cooling Capacity 2.5 kW

Heating Capacity 3.0 kW

Outdoor Unit

Model Mitsubishi HI SCM50ZS-W Outdoor Unit

Cooling Capacity 5.0 kW

Heating Capacity 5.8 kW

Refrigerant R32

Power Supply 20amp supply terminated in a rotary isolator.

Price

Our price for the supply and installation of the equipment all as herein specified

would be: -

£3442.00 + 0%VAT

Completed Total for all four rooms - £6884.00 @ 0% VAT
Click to expand...
 
Last edited:
Here is what Gemini thinks :D

Yes, overall this looks like a very competitive and fair quotation for the equipment and scale of work described.

Mitsubishi Heavy Industries (MHI) is a highly respected, premium brand in the air conditioning industry, known for reliability, efficiency, and quiet operation. They are quoting you a total of £6,884.00 (with 0% VAT) to install a multi-split system covering four separate rooms (Kitchen, Master Bedroom, Lounge, and Second Bedroom).

Here is a detailed breakdown of why this is a good price, along with a couple of crucial things you need to keep in mind before signing.

1. Hardware & Trade Cost Breakdown​

The quote splits the job into two multi-split systems, each featuring one outdoor unit powering two indoor units. If you were to buy these components at retail price yourself in the UK, the hardware alone would cost a substantial portion of this quote:

  • 2 x Outdoor Units (SCM50ZS-W): Retail at roughly £950 – £1,000 each (~£1,900 – £2,000 total).
  • 2 x 3.5 kW Indoor Units (SRK35ZS-WF): Retail at roughly £350 – £450 each if bought as split parts (~£700 – £900 total).
  • 2 x 2.5 kW Indoor Units (SRK25ZS-WF): Retail at roughly £300 – £400 each (~£600 – £800 total).
Estimated Kit/Parts Retail Total: Around £3,200 to £3,700.

2. Labor, Materials, and Margins​

Subtracting the equipment cost leaves roughly £3,100 to £3,600 for the installation itself. For a 4-room multi-split installation, this is a very reasonable rate because it covers:

  • Specialist Materials: Copper refrigerant pipework, Armaflex insulation, condensate drainage, and internal/external cabling.
  • F-Gas Certified Labor: Installing two separate outdoor condensers and routing pipework to four different rooms usually takes a 2-man team about 2 to 3 days of labor.
  • Commissioning: Testing the lines under pressure, vacuuming the systems, and releasing the R32 refrigerant safely.

3. The 0% VAT Benefit​

The contractor has applied 0% VAT to the entire quote. This is because the UK government treats the installation of energy-efficient heat pumps (which air conditioning units technically are when they can heat a home) as zero-rated for VAT. This saves you a massive 20% right off the top, which a less-transparent installer might try to pocket or miscalculate.
Click to expand...
 
No thoughts on the quote? :D

How does Bosch compare to Mitsubishi Heavy Industries? See a lot of local installers putting in Bosch.
 
Installer round these 'ere parts swear by Mitsu and Daikin for commercial stuff.. I once mentioned 'samsung' to the engineers designing our new building systems, they laughed and asked if I'd heard of "A mugs eyeful"..

I'm sure all installers have their fav's, and Bosch are a good company, so maybe look at the features offered vs perceived qualityl, because our Daikin systems in work don't feel very advanced and all their Modoka controllers are a bit noddy..
 
Last edited:
  • Like
Reactions: LiE
Spoken to another installer and they suggested it's better to have 1 bigger unit on the drive way and run the trunking to the rooms, rather than a unit in the garden.

e.g.

https://i.~ibb.co~/ksRSDGzn/IMG-2271-2.jpg
 
We’ve got Mitsubishi systems in all of our offices, and they’re all absolutely pants.


If they’re the supposed best, I’d hate to see other systems :P
 
LiE said:
No thoughts on the quote? :D

How does Bosch compare to Mitsubishi Heavy Industries? See a lot of local installers putting in Bosch.
Click to expand...
I have a 8kW Mitsubishi Heavy Industries external unit and three internal units (a 2.5kW in the lounge and main bedroom and 5kW in the kitchen).

They work really well for us. We paid around £5000 for it all back in June 2022. It hasn't missed a beat since. When all three are going it uses under 2kW. The single kitchen unit will tick along at around 700w usage. It's pretty much inaudible outside when in cooling mode. Sorry for the poor image of the external unit, its from street view as I now have a Daikin ASHP next to it.

https://~ibb.co~/WNHL7xyr
https://~ibb.co~/HfRMSff7
 
Last edited:
  • Like
Reactions: LiE
In practice, they are all a much of a muchness, installers have their preferences based on what they know but thats all its usually based on. None of them will be fitting enough from a variety of brands to get any meaningful picture of failure rates.

I would prioritise how the internal units look. At the end of the day, you have to look at the things for the next 10 years.

@LiE why did the installer suggest one big unit on the drive over 2 units? It's a lot of trunking, could they go via the loft and bin the horizontal runs?
 
b0rn2sk8 said:
In practice, they are all a much of a muchness, installers have their preferences based on what they know but thats all its usually based on. None of them will be fitting enough from a variety of brands to get any meaningful picture of failure rates.

I would prioritise how the internal units look. At the end of the day, you have to look at the things for the next 10 years.

@LiE why did the installer suggest one big unit on the drive over 2 units? It's a lot of trunking, could they go via the loft and bin the horizontal runs?
Click to expand...

If they go via the loft it needs a pump to drain the condensation, which will add noise.

It’s a balance really, the trunking across the back as pictured or an entire AC unit on the wall in the garden. I think the AC unit would look less aesthetically pleasing. Less wiring with 1 unit also. The installer is sizing up a single 10kW unit, I think it will be a lot cheaper too.
 
Next quote, based on a single 10kW unit. This one includes electrical work. I've asked the first company to re-quote based on a single unit setup so I can compare. First company doesn't include any electrical work, which is a faff.

Option 1 – Mitsubishi Premium With WIFI

Master Bedroom – 2kw Wall Mounted Unit
Sons Bedroom – 2kw Wall Mounted Unit
Kitchen Area – 5kw Wall Mounted Unit
Living Room – 3.5kw Wall Mounted Unit
1 Outdoor Condenser - SCM100ZS-W

Total - £6527.00
Click to expand...

Indoor units are the SRK-ZS-WF range.

The 10kW unit is a big boy.

SCM100ZS-W - MHIAE

Air Conditioning - Multi Outdoor Unit RAC - Outdoor Unit
mhiae.com mhiae.com

The indoor units look pretty nice.

SRK20ZS-WF - MHIAE

Air Conditioning - Multi Indoor Unit RAC - Indoor Unit, Wall Mounted
mhiae.com mhiae.com
 
LiE said:
No thoughts on the quote? :D
Click to expand...

It may or may not help. But I had a 2kw Mitsubishi IE system fitted to my garden office last week. Just the one indoor unit and one outdoor unit.

Called round various companies and the majority were quoting around £2k, I managed to get it done for £1,600.00 in the end (wifi enabled indoor unit) I asked the guy who installed it how much it would cost to get three indoor units and one large outdoor unit installed. He said £4k. From that I would think your quote may be a tad high at £6,884.00 for four rooms.

I could provide you with the details of the company I used, just not sure if they would cover your neck of the woods as I am in the south west.
 
Last edited:
I’ve got another quote for £6.5k, and waiting for the first quote to be revised before I try some negotiations. Hopefully can get under £6k.
 
Last edited:
LiE said:
Next quote, based on a single 10kW unit. This one includes electrical work. I've asked the first company to re-quote based on a single unit setup so I can compare. First company doesn't include any electrical work, which is a faff.



Indoor units are the SRK-ZS-WF range.

The 10kW unit is a big boy.

SCM100ZS-W - MHIAE

Air Conditioning - Multi Outdoor Unit RAC - Outdoor Unit
mhiae.com mhiae.com

The indoor units look pretty nice.

SRK20ZS-WF - MHIAE

Air Conditioning - Multi Indoor Unit RAC - Indoor Unit, Wall Mounted
mhiae.com mhiae.com
Click to expand...

Looks to be the same unit range i have, been a great system for the past 3 / 4 years, that outdoor unit is quite a thing make sure they provide a suitably rated supply.
 
  • Like
Reactions: LiE
LiE said:
Next quote, based on a single 10kW unit. This one includes electrical work. I've asked the first company to re-quote based on a single unit setup so I can compare. First company doesn't include any electrical work, which is a faff.

Option 1 – Mitsubishi Premium With WIFI

Master Bedroom – 2kw Wall Mounted Unit
Sons Bedroom – 2kw Wall Mounted Unit
Kitchen Area – 5kw Wall Mounted Unit
Living Room – 3.5kw Wall Mounted Unit
1 Outdoor Condenser - SCM100ZS-W

Total - £6527.00

Indoor units are the SRK-ZS-WF range.

The 10kW unit is a big boy.

SCM100ZS-W - MHIAE

Air Conditioning - Multi Outdoor Unit RAC - Outdoor Unit
mhiae.com mhiae.com

The indoor units look pretty nice.

SRK20ZS-WF - MHIAE

Air Conditioning - Multi Indoor Unit RAC - Indoor Unit, Wall Mounted
mhiae.com mhiae.com
Click to expand...
Going with this quote. The other guy came back with his price for a like for like and it was £6,850.00 excluding any electrical work. So a good £600-700 more for the same thing.

He did suggest going with 2 x 5kW units as they aren't as unsightly as the big boi 10kW, but decided against it in the end. 1 due to the fact our consumer unit has only 1 free slot and 2 x 5kW would need 2 and secondly, it's on the drive way side of the house out of sight so doesn't need to look pretty.

Looking at mid July for install.
 
Last edited:
  • Like
Reactions: LiE
You must log in or register to reply here.
Back
Top Bottom